Andy Whitcroft 0360ce1eaf PM / hibernate: memory_bm_find_bit(): Tighten node optimisation ... [ Upstream commit da6043fe85 ] When looking for a bit by number we make use of the cached result from the preceding lookup to speed up operation. Firstly we check if the requested pfn is within the cached zone and if not lookup the new zone. We then check if the offset for that pfn falls within the existing cached node. This happens regardless of whether the node is within the zone we are now scanning. With certain memory layouts it is possible for this to false trigger creating a temporary alias for the pfn to a different bit. This leads the hibernation code to free memory which it was never allocated with the expected fallout. Ensure the zone we are scanning matches the cached zone before considering the cached node. Deep thanks go to Andrea for many, many, many hours of hacking and testing that went into cornering this bug. Reported-by: Andrea Righi <andrea.righi@canonical.com> Tested-by: Andrea Righi <andrea.righi@canonical.com> Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-01-09 10:19:51 +01:00
..
Kconfig	pci-v5.3-changes	2019-07-15 20:44:49 -07:00
Makefile	PM: Introduce an Energy Model management framework	2018-12-11 15:16:58 +01:00
autosleep.c	PM / wakeup: Show wakeup sources stats in sysfs	2019-08-21 00:20:40 +02:00
console.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
energy_model.c	sched/topology: Remove unused 'sd' parameter from arch_scale_cpu_capacity()	2019-06-24 19:23:39 +02:00
hibernate.c	hibernate: Disable when the kernel is locked down	2019-08-19 21:54:15 -07:00
main.c	PM: sleep: include <linux/pm_runtime.h> for pm_wq	2019-10-10 11:11:56 +02:00
power.h	PM: hibernate: powerpc: Expose pfn_is_nosave() prototype	2019-06-14 10:48:56 +02:00
poweroff.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248	2019-06-19 17:09:08 +02:00
process.c	PM / sleep: Show freezing tasks that caused a suspend abort	2018-09-10 12:09:10 +02:00
qos.c	PM: QoS: Invalidate frequency QoS requests after removal	2019-11-20 10:46:42 +01:00
snapshot.c	PM / hibernate: memory_bm_find_bit(): Tighten node optimisation	2020-01-09 10:19:51 +01:00
suspend.c	PM: suspend: Fix platform_suspend_prepare_noirq()	2019-08-10 13:18:06 +02:00
suspend_test.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
swap.c	kernel: power: swap: use kzalloc() instead of kmalloc() followed by memset()	2019-06-28 10:20:39 +02:00
user.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
wakelock.c	PM / wakeup: Show wakeup sources stats in sysfs	2019-08-21 00:20:40 +02:00